Generalized slave-particle method for extended Hubbard models

Alexandru B. Georgescu and Sohrab Ismail-Beigi
Phys. Rev. B 92, 235117 – Published 8 December 2015

Abstract

We introduce a set of generalized slave-particle models for extended Hubbard models that treat localized electronic correlations using slave-boson decompositions. Our models automatically include two slave-particle methods of recent interest, the slave-rotor and slave-spin methods, as well as a ladder of new intermediate models where one can choose which of the electronic degrees of freedom (e.g., spin or orbital labels) are treated as correlated degrees of freedom by the slave bosons. In addition, our method removes the aberrant behavior of the slave-rotor model, where it systematically overestimates the importance of electronic correlation effects for weak interaction strength, by removing the contribution of unphysical states from the bosonic Hilbert space. The flexibility of our formalism permits one to separate and isolate the effect of correlations on the key degrees of freedom.

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  • Received 15 July 2015
  • Revised 29 October 2015

DOI:https://doi.org/10.1103/PhysRevB.92.235117

©2015 American Physical Society

Authors & Affiliations

Alexandru B. Georgescu1,2 and Sohrab Ismail-Beigi3,1,2,4

  • 1Department of Physics, Yale University, New Haven, Connecticut 06520, USA
  • 2Center of Research on Interface Structure and Phenomena, Yale University, New Haven, Connecticut 06520, USA
  • 3Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA
  • 4Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06520, USA

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Issue

Vol. 92, Iss. 23 — 15 December 2015

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